Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..581m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 2, p. 581-584
Astronomy and Astrophysics
Astronomy
1
Ammonia, Cores, Decoupling, Density (Number/Volume), Interstellar Gas, Interstellar Magnetic Fields, Molecular Clouds, Emission Spectra, Morphology, Radio Astronomy, Rotation, Spatial Resolution, Statistical Analysis
Scientific paper
In this paper we report on NH3 observations towards regions where cores with densities greater than or equal to 104 cm-3 were expected to exist, in order to verify the conjectured non-correlation between their morphology and their axis of rotation with the magnetic field (Heyer 1998). Among five predicted cores we have detected only one, and this one has different parameters from those predicted. We also mapped in NH3 (1, 1), three sources from the sample by Meyers & Benson (1983) with higher spatial resolution. In the four cores we detected, of density n greater than or equal to 105 cm-3, there is no obvious relationship between the orientation of the rotation axis, the flattening, and the magnetic field. This non- correlation might indicate that at this density the magnetic field stresses are already dynamically unimportant. However, a statistically significant sample of dense cores has to be studied to establish this conclusion.
Lizano Susana
Massi Maria
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